# TPS54678RTER

**Texas Instruments** · DC-DC Converters · WQFN-16-EP(3x3)

TPS54678RTER from Texas Instruments, in a WQFN-16-EP(3x3). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | power_in | Input supply voltage, 2.95 V to 6 V. |
| 2 | VIN | power_in | Input supply voltage, 2.95 V to 6 V. |
| 3 | GND | power_in | Power ground that should be electrically connected directly to the thermal pad under the device. |
| 4 | GND | power_in | Power ground that should be electrically connected directly to the thermal pad under the device. |
| 5 | AGND | power_in | Analog ground that should be electrically connected to GND close to the device. |
| 6 | VSENSE | input | Inverting node of the transconductance (gm) error amplifier. |
| 7 | COMP | output | Error amplifier output and input to the output switch current comparator; frequency compensation components should be connected to this pin. |
| 8 | RT/CLK | bidirectional | Resistor Timing or External Clock input pin for adjusting switching frequency from 200 kHz to 2 MHz or synchronizing to an external clock. |
| 9 | SS/TR | bidirectional | Slow-start and Tracking pin; an external capacitor connected to this pin sets the output voltage rise time and can be used for tracking. |
| 10 | PH | output | Source of the internal high-side power MOSFET and drain of the internal low-side synchronous rectifier MOSFET. |
| 11 | PH | output | Source of the internal high-side power MOSFET and drain of the internal low-side synchronous rectifier MOSFET. |
| 12 | PH | output | Source of the internal high-side power MOSFET and drain of the internal low-side synchronous rectifier MOSFET. |
| 13 | BOOT | input | Bootstrap capacitor connection; a 0.1 μF ceramic capacitor is required between BOOT and PH; output is forced to switch off if voltage falls below minimum BOOT UVLO threshold of 2.2 V. |
| 14 | PWRGD | output | Open-drain output that asserts low if output voltage is low due to thermal shutdown, overvoltage, undervoltage, or EN shutdown; de-asserts when VSENSE is within 93% to 103% of internal reference. |
| 15 | EN | input | Enable pin with internal pullup current source; pull below 1.2 V to disable, float to enable; rising threshold 1.3 V, falling threshold 1.18 V; can be used to set on/off threshold with two additional resistors. |
| 16 | VIN | power_in | Input supply voltage, 2.95 V to 6 V. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-16-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `TPS54678RTER`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: WQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `tps54678rter-etched.step` / `tps54678rter-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps54678rter.step` / `tps54678rter.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tps54678) (44 pp, sha256 `5946bc6105aff6d5`, retrieved 2026-09-26, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tps54678rter-datasheet.pdf)